module.exports = {
  mode: 'development',
  module:{
    rules:[{
      test:/\.js$/,
      exclude: /node_modules/,
      use:{
        loader:'babel-loader',
        options:{
          presets:[["@babel/preset-env",{
            useBuiltIns:"usage"
          }],"@babel/preset-react"]
        }
      }
    }]
  }
}